Kathryn McDonough Kathryn McDonough, 19, of Portsmouth, was arrested on Dec. 24 and charged with one felony count each of hindering apprehension or prosecution and conspiracy to do the same in connection with the death of Elizabeth Marriott. (Photo courtesy New Hampshire Attorney General's Office)

BRENTWOOD — The Portsmouth woman charged with lying to police about her whereabouts on the night Elizabeth Marriott went missing remains incarcerated in a Rockingham County jail after being arrested earlier this week.

Kathryn “Kat” McDonough, 19, was ordered held on $35,000 cash bail or corporate surety at her arraignment in Derry Circuit Court on Wednesday.

McDonough, of 450 Greenside Ave., was arrested on Monday and charged with one felony count of hindering apprehension or prosecution and one felony count of conspiracy to commit hindering apprehension or prosecution. Both are Class B felonies, and each carries a sentence of up to 7 years imprisonment.

According to a court document, McDonough allegedly agreed with murder suspect Seth Mazzaglia to “cause the commission of the crime of hindering apprehension or prosecution.” The pair both allegedly lied to police during interviews on Oct. 12 in Newington.

There, police say, Mazzaglia and McDonough gave investigators false alibis regarding their whereabouts Oct. 9 and their interaction with Marriott that night.

Rockingham County Department of Corrections Superintendent Stephen Church said Friday afternoon that McDonough has not made bail, and remains in jail.

She is next scheduled to appear in court on Jan. 2 for a probable cause hearing in Portsmouth Circuit Court.